Transition services on a student's IEP are addressed no later than the first IEP in effect when the student turns age 15. This information is updated annually until the student leaves the school setting. 

Transition Assessments  

Student Exit Pathways 

NYSED: Diploma/Credential Requirements - New York State Education Department

Dearlove, L., & Loughran-Amorese, E. (2017). Transition Resource Manual.